murphyAspartic Acid
AKA: L-aspartic acid, 56-84-8, (2S)-2-aminobutanedioic acid, Asparagic acid, L-Aminosuccinic acid, Asparaginic acid, L-Asparaginic acid, (S)-2-Aminosuccinic acid, L-Asparagic acid
Synthetic
Skin Conditioner
Hair Care
Acid
Clean
OriginSynthesized from fumaric acid or maleic acid through chemical reduction and transamination reactions. Produced via fermentation of glucose using microorganisms or chemical synthesis from petroleum-derived precursors.
Aspartic Acid is a non-essential amino acid in humans, Aspartic Acid has an overall negative charge and plays an important role in the synthesis of other amino acids and in the citric acid and urea cycles. Asparagine, arginine, lysine, methionine, isoleucine, and some nucleotides are synthesized from aspartic acid. Aspartic acid also serves as a neurotransmitter. (NCI04)
Solubility 5390
Formula
C4H7NO4
Mol. Weight
133.10
CAS #
56-84-8, 617-45-8
Form
Liquid
State
Dry Powder
Skin Types
●all-skin-types, gentle
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
Functions
Antistatic
Hair Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Locks in moisture
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Skin Irritant
3 studies / 3 not irritating (CIR 607)
Not a Sensitizer
2 studies / 2 not sensitizing (CIR 607)
Eye Irritant in Testing
2 studies / 2 irritating / reactions weak to moderate (CIR 607)
Concentration Guide
Leave-on0.000005–0.6%
Rinse-off0.0001–1%
0%50%100%
CIR reported use · report published 2013
Regulatory Agencies
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR